<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>selector</title>
	<style type="text/css">
		p{
			font-size: 40px;
		}
		#cla{
			font-size: 30px;
			color: gray;
		}
		.well{
			background: red;
		}
		*{
			font-family: "微软雅黑";
		}
	</style>
</head>
<body>
	<p class="well">学习</p>
	<p id="cla" class="well">教育</p>
	<h1>标题</h1>
	<h2 class="well">2级标题</h2>
</body>
</html>